It's a corker (an excellent person or thing; something that closes a discussion, from the notion of putting a cork in it), a cracker, a whizz, a snozzler (if you're a New Zealander), even a anger-cutter (North American, naturally) or any one of numerous alternatives, all dated, located and explained.

Normally, though, it seems to be a slang term for a flat military cap known as a garrison cap, which has an even more vulgar synonym.

actually it came out just as I wrote it, pee as in the Letter . I used to hear it a lot as a child, but it might have been one of my aunt's weirdnesses, Like she'd say falsa ketsa for someone who was two-faced [not seeing her own double-visage].

mark distaff-crazies-the-lot Bailey

I noticed it was one of the yahoo questions but no one found an answer for it. I just wondered if anyone here had heard it.

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kb